Gregory Jon Martinez believed that police's use of lethal force was justifiable -- and he expressed condolences for the family of the hostage found dead after the hour-long robbery, car chase and gun fight.

"We hold no animosity or blame the Stockton Police Department for behaving the way they did," said Martinez, noting that some of his family members are in law enforcement. "We believe that given the circumstances, the department behaved in a manner that was appropriate."

His son, Alex Gregory Martinez, 27, was one of two suspects killed Wednesday; a third survived after authorities said he used Misty Holt-Singh as a human shield during the fight with police.

The father expressed condolences to Holt-Singh's family, hours after the victim's family gave an emotional news conference in which they expressed compassion for the families of the dead suspects.

"We're so, so sorry that this happened," the father said. "I wish I could take away their pain."

Holt-Singh's family will launch its own investigation into the incident, announcing in the news conference that it's seeking documents, dispatch logs, video and other evidence police gathered during and after the violence.

Family attorney Greg Bentley said he also wants police department guidelines and protocols for high-speed pursuits and use of deadly force as well as video taken by witnesses.

Holt-Singh, 41, was taken hostage in a Bank of West branch by AK-47 wielding robbers while her 12-year-old daughter waited outside in the car.

The mother of two was shot while in the back of the suspects' stolen SUV during the ensuing gun battle after they stopped fleeing and turned to face police with their assault rifles.

Authorities say they are still trying to determine whether the suspects or police shot Holt-Singh.

"We don't even know who fired what, how many weapons were fired," said San Joaquin County Deputy District Attorney Robert Himelblau. "We haven't figured out which bad guy was firing which weapon...which bullets hit who."

The other slain suspect was Gilbert Renteria Jr., 30, who was described as a distant cousin of Alex Gregory Martinez.

Martinez's relatives said the two were close, but they didn't know their relationship to the surviving suspect, 19-year-old Jaime Ramos.

Ramos was to be arraigned in San Joaquin Superior Court on Monday. The district attorney said it's likely Ramos will be charged with multiple counts of murder.

An autopsy may determine who shot Holt-Singh.

Holt-Singh and a pair of bank employees were forced into a stolen SUV at gunpoint just as police converged on the parking lot of the bank. The two bank employees survived the ordeal by getting thrown from the SUV as it sped through town.

Police spokesman Joe Silva said one of the bank employees was initially forced to drive the SUV out of the parking lot before being shot and pushed out the door.

Most police departments discourage shooting at getaway cars during chases. But the taking of hostages and hail of bullets coming from the suspect's vehicle forced Stockton police to make the split-second decision to use their own weapons while knowing they might harm an innocent civilian.

Stockton police also recovered Friday afternoon a dark-colored sedan captured in video dropping off the suspects. The Buick, which had no license plate, was found abandoned in a neighborhood about a 10 minutes' drive away from the bank.

Silva said investigators are still trying to determine a motive. He said the two dead suspects were "documented" members of the Nortenos, a Northern California gang controlled from California's prisons by the Nuestra Familia. Silva said Ramos is an "associate" of the gang.

"We don't know if this robbery occurred to benefit the gang or for their own purposes," Silva said.

Gregory Jon Martinez said his son was no longer active in a gang, and that he believed his son was motivated by financial need. He said his son lost his job as a forklift operator, had a drug addiction and was seeking surgical treatment for a degenerative left eye.

The suspect leaves behind a 3-year-old son, who was among more than a dozen relatives who gathered outside the family's Catholic church to support the elder Martinez.

Silva said about 30 officers have been placed on paid, three-day administrative leave, a routine procedure for police-involved shootings.

Silva said the department is paying other officers overtime to cover the open shifts, declining offers from neighboring agencies for additional help.

Holt-Singh's husband, two children and sister briefly addressed the media Friday to discuss the loss of a wife, mother and sibling.

"What happened to Misty is a nightmare," husband Paul Singh said. "It's something I would never want to happen to anybody."

Daughter Mia Singh was waiting in the car while her mother was in the bank withdrawing money for a haircut, said family friend and lawyer Michael Platt.

Mia recalled how Holt-Singh attended all her softball games and never forgot to bring orange juice.

Mia said her mother was always trying to get in on her Snapchat sessions and relentlessly chewed on ice.

"Always," Mia said in tandem with her father as they laughed about the ice chewing.

"I love you mom," Mia said before turning to her father for comfort.

During the emotional news conference Friday, family members talked about their faith. Holt-Singh's sister Dawn Holt said she's praying for the families of the dead suspects.

"We do need to give those families respect because they lost someone they love too," she said.

THE FATHER OF ONE OF THE MEN INVOLVED IN THE DEADLY BANK ROBBERY CHASE IS SPEAKING OUT. HE IS SUPPORTING THE POLICE DEPARTMENT AND APOLOGIZING FOR THE VICTIM'S FAMILY. I WANT TO EXPRESS MY DEEPEST CONDOLENCES ON BEHALF OF MY FAMILY AND MYSELF TO THE FAMILY OF MISTY. THE FATHER OF ONE OF THE ROBBERS WHO WAS KILLED SAID HE FELT COMPELED TO SPEAK OUT AFTER HEARING COMMENTS EARLIER TODAY FROM THE VICTIM'S SISTER DECPWFMENT EVEN THOUGH MY SISTER WAS THE VICTIM OF A TERRIBLE CRIME, THERE ARE OTHER PEOPLE OUT THERE THAT HAVE ALSO LOST SOMEONE AND 24E HAVE GRIEF THEY HAVE TO ACCEPT -- THEY HAVE GRIEF THEY HAVE TO RESPECT. AND LET'S RESPECT THE ROBBER'S FAMILY'S GRIEF AS WELL. TONIGHT TWO FAMILIES ARE EXPRESSING THEIR GRIEF. TOMORROW NIGHT A VIGIL WILL BE HELD FOR THE HOSTAGE WHO WAS KILLED ON WEDNESDAY DURING A VIOLENT CRIME SPREE. TOM IS THE ONLY TELEVISION REPORT TORE IS IT DOWN WITH THE FAMILY OF ONE OF THE ROBBERS. WHAT IS THE FATHER SAYING TONIGHT? THE FATHER OF ONE OF THE SUSPECTS INVOLVED WHO WAS ROBBING, TERRORIZING THE ENTIRE COMMUNITY, HOLDING HOSTAGES, SPRAYING GUNFIRE EVERYWHERE SAYS THAT THE FAMILY IS COMPLETELY DEVASTATED. HE SAYS THE TWO SUSPECTS WHO DIED WERE COUSINS AND GOOD FRIENDS AND THE FATHER IS BLAMING ALL OF THIS ON DRUG ADDICTION. I WANT TO EXPRESS MY DEEPEST CONDOLENCES ON BEHALF OF MY FAMILY. GRIPPED WITH SORROW AND SHOCK HE SAID HIS FIRST PRIORITY WAS TO REACH OUT OF THE FAMILY OF THE HOSTAGE WHO DIED. MY HEART GOES OUT TO THEM. IF I COULD I WOULD TAKE THEIR PAIN AND CARRY IT FOR THEM. HE IS THE FATHER OF ALEX MARTINEZ, THE 27-YEAR-OLD WHO POLICE SAY IT WAS PRIMARY GUNMAN WHO SPRAYED AUTOMATIC WEAPON FIRE AT POLICE DURING THE HOUR LONG HOSTAGE CHASE IN STOCKTON ON WEDNESDAY. HIS FATHER IS BLIND SIDED. WE DIDN'T SEE THIS COMING. IT WASN'T HIS PERSONALITY. HIS SON, A PROUD AMERICAN INDIAN WAS ADDICTED TO COCAINE AND WAS GOING BLIND BUT WHY THE EXTREME VIOLENCE? MAYBE IT WENT BAD AND THERE WAS FEAR. THE FEAR KICKED IN. MARTINEZ SAID HIS SON WAS IN A GANG AND LEFT BUT NEVER GAVE UP CRIME. MY MOM IS DEVASTATED. IT'S CAUGHT HER AND ALL OF MY FAMILY LIKE WHERE DID THIS COME FROM. I DON'T KNOW. I STILL CAN'T BELIEVE IT. MARTINEZ SAID THE CRIME IS SO TERRIBLE AND SO PAINFUL HE CAN'T WATCH THE NEWS OR READ THE NEWSPAPER. AFTER HE HEARD THE KIND WORDS TODAY, HE WANTED TO SPEAK. MY FAMILY AND I WISH TO OFFER OUR HEART FELT APOLOGY FOR THE ENTIRE COMMUNITY FOR THE RIPPLE EFFECTS OF THIS TRAGIC EVENT. EVENTUALLY TOXICOLOGY REPORTS WILL TELL US EXACTLY WHICH DRUGS WERE INVOLVED IN THIS CRIME. THE FATHER SAYS HE MAKES NO EXCUSES FOR HIS SON AND STOCKTON POLICE TOOK THE APPROPRIATE ACTION TO STOP HIM. POLICE ARE SEARCHING FOR A FOURTH SUSPECT IN THE CASE. THE PERSON DRIVING THIS SEDAN WHO DROPPED OFF THE OTHER THREE FOR THE CRIME SPREE. POLICE FOUND THE CAR BUT HAVE NOT CAUGHT UP WITH THE DRIVER. ABOUT ONE HOUR AFTER WE RELEASED THE VIDEO TO THE MEDIA AND ON SOCIAL MEDIA, WE STARTED GETTING TIPS COMING IN TO THE POLICE DEPARTMENT AND CRIME STOPPERS THAT A POSSIBLE SUSPECT VEHICLE FROM THAT TRAGIC BANK ROBBERY WAS HERE ON WEST CREEK. SO THE VEHICLE IS IMPORTANT EVIDENCE BUT POLICE NEED HELP FINDING THE PERSON THAT WAS DRIVING THE CAR. HERE IS A LOOK AT THE OTHER THREE SUSPECTS. A VIGIL WILL BE HELD TOMORROW TO HONOR THE VICTIMS OF THE CRIME SPREE. IT WILL START AT 8:00. BECAUSE OF LIMITED PARKING PEOPLE ARE BEING URGED TO CAR POOL OR FIND OTHER WAYS TO GET THERE. SOME MEMBERS OF HER FAMILY ARE EXPECTED TO ATTEND. EARLIER TODAY HER FAMILY GATHERED TO TALK ABOUT THE DEVOTED MOTHER. THE TYPE OF WOMAN SHE WAS, SHE WAS THE MOST CARING, LOVING MOTHER AND WIFE. SHE WOULD NEVER DO FOR HER. IT WAS ALWAYS FOR US AND THAT'S WHAT MAKES IT SO TOUGH IS SHE WAS OUR ROCK. SHE DID EVERYTHING FOR US. AND I WANT TO MAKE SURE THAT HER STORY IS TOLD. SHE WAS LOVED BY EVERYONE, ALL MY FRIENDS, ALL MY TEACHERS, MY YOUTH PASTOR. EVERYBODY WHO KNEW HER LOVED HER. IT'S HARD TO THINK THAT SHE'S NOT THERE ANYMORE. I WANT TO THANK EVERYONE WHO HAS BEEN THERE AND IT MEANS A LOT. AND I LOVE YOU MOM. YOU CAN SEE THE FAMILY'S ENTIRE STATEMENT ON OUR WEBSITE.